recently, the stam has been mj's most popular bag. it's been seen on the arms of many celebrities in countless magazines and it was granted the coveted "it bag" status alongside the chloe paddingon, ysl muse, etc.
to me the signature bag would have to be the venetia with the stella coming in a close second. these bags have been the mainstay of his line for years now. had there been the level of tabloid frenzy then as there is presently, those bags would have had a lot more exposure like the stam.
as a result, the stam has become the most recognizable mj bag, but imo it's not a classic like the venetia or stella. i can see it becoming a signature, more timeless style if people don't get sick of it due to its overexposure.